Adding button to order admin to reset digital downloads

* Resets expire time
* Resets download count

app/controllers/spree/admin/orders_controller_decorator.rb

@@ -0,0 +1,7 @@
+Spree::Admin::OrdersController.class_eval do
+  def reset_digitals
+    @order.reset_digital_links!
+    flash[:notice] = t(:downloads_reset)
+    redirect_to admin_order_url(@order)
+  end
+end

app/overrides/add_reset_digitals_to_admin_orders.rb

@@ -0,0 +1,7 @@
+Deface::Override.new(:virtual_path => "spree/admin/shared/_order_tabs",
+                     :name => "add_reset_}digitals_to_admin_orders",
+                     :insert_after => ".sidebar",
+                     :text => %q{
+<%= content_tag(:p, button_link_to(t(:reset_downloads), reset_digitals_admin_order_url(@order)), class: 'clear') if @order.digital? or true %>
+                      },
+                     :disabled => false)